/** @file
  Support functions for managing protocol.

Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef  _HAND_H_
#define  _HAND_H_


#define EFI_HANDLE_SIGNATURE            SIGNATURE_32('h','n','d','l')

///
/// IHANDLE - contains a list of protocol handles
///
typedef struct {
  UINTN               Signature;
  /// All handles list of IHANDLE
  LIST_ENTRY          AllHandles;
  /// List of PROTOCOL_INTERFACE's for this handle
  LIST_ENTRY          Protocols;      
  UINTN               LocateRequest;
  /// The Handle Database Key value when this handle was last created or modified
  UINT64              Key;
} IHANDLE;

#define ASSERT_IS_HANDLE(a)  ASSERT((a)->Signature == EFI_HANDLE_SIGNATURE)

#define PROTOCOL_ENTRY_SIGNATURE        SIGNATURE_32('p','r','t','e')

///
/// PROTOCOL_ENTRY - each different protocol has 1 entry in the protocol
/// database.  Each handler that supports this protocol is listed, along
/// with a list of registered notifies.
///
typedef struct {
  UINTN               Signature;
  /// Link Entry inserted to mProtocolDatabase
  LIST_ENTRY          AllEntries;  
  /// ID of the protocol
  EFI_GUID            ProtocolID;  
  /// All protocol interfaces
  LIST_ENTRY          Protocols;     
  /// Registerd notification handlers
  LIST_ENTRY          Notify;                 
} PROTOCOL_ENTRY;


#define PROTOCOL_INTERFACE_SIGNATURE  SIGNATURE_32('p','i','f','c')

///
/// PROTOCOL_INTERFACE - each protocol installed on a handle is tracked
/// with a protocol interface structure
///
typedef struct {
  UINTN                       Signature;
  /// Link on IHANDLE.Protocols
  LIST_ENTRY                  Link;   
  /// Back pointer
  IHANDLE                     *Handle;  
  /// Link on PROTOCOL_ENTRY.Protocols
  LIST_ENTRY                  ByProtocol; 
  /// The protocol ID
  PROTOCOL_ENTRY              *Protocol;  
  /// The interface value
  VOID                        *Interface; 
  /// OPEN_PROTOCOL_DATA list
  LIST_ENTRY                  OpenList;       
  UINTN                       OpenListCount;

} PROTOCOL_INTERFACE;

#define OPEN_PROTOCOL_DATA_SIGNATURE  SIGNATURE_32('p','o','d','l')

typedef struct {
  UINTN                       Signature;
  ///Link on PROTOCOL_INTERFACE.OpenList
  LIST_ENTRY                  Link;      

  EFI_HANDLE                  AgentHandle;
  EFI_HANDLE                  ControllerHandle;
  UINT32                      Attributes;
  UINT32                      OpenCount;
} OPEN_PROTOCOL_DATA;


#define PROTOCOL_NOTIFY_SIGNATURE       SIGNATURE_32('p','r','t','n')

///
/// PROTOCOL_NOTIFY - used for each register notification for a protocol
///
typedef struct {
  UINTN               Signature;
  PROTOCOL_ENTRY      *Protocol;
  /// All notifications for this protocol
  LIST_ENTRY          Link;                   
  /// Event to notify
  EFI_EVENT           Event;    
  /// Last position notified
  LIST_ENTRY          *Position;              
} PROTOCOL_NOTIFY;



/**
  Finds the protocol entry for the requested protocol.
  The gProtocolDatabaseLock must be owned

  @param  Protocol               The ID of the protocol
  @param  Create                 Create a new entry if not found

  @return Protocol entry

**/
PROTOCOL_ENTRY  *
CoreFindProtocolEntry (
  IN EFI_GUID   *Protocol,
  IN BOOLEAN    Create
  );


/**
  Signal event for every protocol in protocol entry.

  @param  ProtEntry              Protocol entry

**/
VOID
CoreNotifyProtocolEntry (
  IN PROTOCOL_ENTRY   *ProtEntry
  );


/**
  Finds the protocol instance for the requested handle and protocol.
  Note: This function doesn't do parameters checking, it's caller's responsibility
  to pass in valid parameters.

  @param  Handle                 The handle to search the protocol on
  @param  Protocol               GUID of the protocol
  @param  Interface              The interface for the protocol being searched

  @return Protocol instance (NULL: Not found)

**/
PROTOCOL_INTERFACE *
CoreFindProtocolInterface (
  IN IHANDLE        *Handle,
  IN EFI_GUID       *Protocol,
  IN VOID           *Interface
  );


/**
  Removes Protocol from the protocol list (but not the handle list).

  @param  Handle                 The handle to remove protocol on.
  @param  Protocol               GUID of the protocol to be moved
  @param  Interface              The interface of the protocol

  @return Protocol Entry

**/
PROTOCOL_INTERFACE *
CoreRemoveInterfaceFromProtocol (
  IN IHANDLE        *Handle,
  IN EFI_GUID       *Protocol,
  IN VOID           *Interface
  );


/**
  Connects a controller to a driver.

  @param  ControllerHandle                      Handle of the controller to be
                                                connected.
  @param  ContextDriverImageHandles             DriverImageHandle A pointer to an
                                                ordered list of driver image
                                                handles.
  @param  RemainingDevicePath                   RemainingDevicePath A pointer to
                                                the device path that specifies a
                                                child  of the controller
                                                specified by ControllerHandle.

  @retval EFI_SUCCESS                           One or more drivers were
                                                connected to ControllerHandle.
  @retval EFI_OUT_OF_RESOURCES                  No enough system resources to
                                                complete the request.
  @retval EFI_NOT_FOUND                         No drivers were connected to
                                                ControllerHandle.

**/
EFI_STATUS
CoreConnectSingleController (
  IN  EFI_HANDLE                ControllerHandle,
  IN  EFI_HANDLE                *ContextDriverImageHandles OPTIONAL,
  IN  EFI_DEVICE_PATH_PROTOCOL  *RemainingDevicePath       OPTIONAL
  );

/**
  Attempts to disconnect all drivers that are using the protocol interface being queried.
  If failed, reconnect all drivers disconnected.
  Note: This function doesn't do parameters checking, it's caller's responsibility
  to pass in valid parameters.

  @param  UserHandle             The handle on which the protocol is installed
  @param  Prot                   The protocol to disconnect drivers from

  @retval EFI_SUCCESS            Drivers using the protocol interface are all
                                 disconnected
  @retval EFI_ACCESS_DENIED      Failed to disconnect one or all of the drivers

**/
EFI_STATUS
CoreDisconnectControllersUsingProtocolInterface (
  IN EFI_HANDLE           UserHandle,
  IN PROTOCOL_INTERFACE   *Prot
  );


/**
  Acquire lock on gProtocolDatabaseLock.

**/
VOID
CoreAcquireProtocolLock (
  VOID
  );


/**
  Release lock on gProtocolDatabaseLock.

**/
VOID
CoreReleaseProtocolLock (
  VOID
  );


/**
  Check whether a handle is a valid EFI_HANDLE

  @param  UserHandle             The handle to check

  @retval EFI_INVALID_PARAMETER  The handle is NULL or not a valid EFI_HANDLE.
  @retval EFI_SUCCESS            The handle is valid EFI_HANDLE.

**/
EFI_STATUS
CoreValidateHandle (
  IN  EFI_HANDLE                UserHandle
  );

//
// Externs
//
extern EFI_LOCK         gProtocolDatabaseLock;
extern LIST_ENTRY       gHandleList;
extern UINT64           gHandleDatabaseKey;

#endif
